Going to the anki download page
2.1.17 is said to be latest but is not, it should be 2.1.18
going to the downloads archive you can download latest
if you mean 2.1.58, it was released less than a day ago, hence why it was said 2.1.57 was the latest, but now it is fixed
https://apps.ankiweb.net
if this is about linux version from Debian/Ubuntu